JAVASCRIPT

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JavaScript Theory

Variables in javascript:

A variable is a name which is associated with a value that can be changed. It is a name of memory location.

Types of variable:

Local variables:

The variable are declared inside a function is called local variable. That means it cannot access the outside that function.

Syntax
function skill()
{ var x = 10; // Local variable
}

Global variable:

The variables are declared outside the function is called global variable.

Syntax
var x = 10; // Global variable
function skill()
{ document.writedocument.write(x);
 }
skill(); // calling function

Data Types in java script:

Data types specifies the type of values that can be stored in the variable. There are two types of data types in java script.

  1. Primitive Data type
  2. Non-primitive Data type

Primitive data types

  1. String
  2. Number
  3. Boolean
  4. Null
  5. Undefined
String

This data type is used to represents sequence of characters.

Ex. "SkillPundit".
Number

This data type is used to represents numeric values.

Ex. 25, 65.39, 54.
Boolean

This data type is used to represents boolean values

Ex. Ture or false.
Null

This data type has only one value i.e. null. It has no value.

Non-primitive data types

  1. Object
  2. Date
  3. Array